QUESTION 89What action does a switch take if the destination MAC address is unknown?

A. Discard frameB. Send ICMP unreachable message to sourceC. Flood packet on all portsD. Compare destination IP address against an ACL to determine if it is permittedE. Send gratuitous ARP on all ports and wait for reply before forwarding

Answer: CExplanation:“What happens though when the switch receives a frame with a destination MAC address that is not included in the table? In that case the switch will just broadcast/flood the frame with the unknown destination address to all of its ports (apart from the port where the frame came from). This process is called unknown unicast flooding. ” http://telconotes.wordpress.com/2013/03/09/how-a-switch-works/

QUESTION 90A network administrator is tasked with creating a switched virtual interface for VLAN 100 on a new Cisco Nexus switch. Which two commands does the network administrator need? (Choose two.)

QUESTION 91Which statement describes the purpose of the MAC address forwarding table of a switch?

A. The switch consults the forwarding table to determine the best route to a destination.B. The switch consults the forwarding table to determine the output port.C. The switch consults the forwarding table to determine if the packet is routable.D. The switch consults the forwarding table to determine if access control permits the packet.

Answer: AEExplanation:It defines the electrical and physical specifications of the data connection. It defines the relationship between a device and a physical transmission medium (e.g. a copper or fiber optical cable). This includes the layout of pins, voltages, line impedance, cable specifications, signal timing, hubs, repeaters, network adapters, host bus adapters (HBA used in storage area networks) and more.”http://en.wikipedia.org/wiki/OSI_model

QUESTION 93Which two layers of the OSI model are combined in the Internet protocol suite application layer? (Choose two.)

Answer: BEExplanation:“- a bridge is a two interfaces device that creates 2 collision domains, since it forwards the traffic it receives from one interface only to the interface where the destination layer 2 device (based on his mac address) is connected to. A bridge is considered as an “intelligent hub” since it reads the destination mac address in order to forward the traffic only to the interface where it is connected”https://learningnetwork.cisco.com/thread/1734

QUESTION 97In an IEEE 802.3 Ethernet frame, what is the significance of the DSAP field?

A. The DSAP field specifies the TCP or UDP port that is associated with the transport protocol.B. The DSAP field is only used on United States Department of Defense networks to indicate the information classification level.C. The DSAP field is only used in Ethernet II frames.D. The DSAP field indicates the network layer protocol.

Answer: D

QUESTION 98Refer to the exhibit. What two commands will allow the Nexus 5000 switch to continue to boot? (Choose two.)